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Be aware how your voice works. Have you ever pulled the open end of an air filled balloon tight and the air rushes out at a squeal like pitch, then the more you open the balloon, the quieter and lower the pitch gets. This is a literal representation of your vocal chords.
To help prevent disorders caused by vocal abuse (including laryngitis, vocal cord nodes and polyps, and contact ulcers), you need to learn how to talk without straining your vocal cords. A voice therapist can teach you how to do this.